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Convertible Preferred Stock and Stockholders' Deficit - Summary of Common Stock Issued and Reserved for Issuance (Parenthetical) (Details) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2018 | Dec. 31, 2017
Series A-2 Convertible Preferred Stock |  |
Stockholders Deficit [Line Items] |  |
Convertible preferred stock converted to common stock, ratio | 3.539% | 3.539%
Series B Convertible Preferred Stock |  |
Stockholders Deficit [Line Items] |  |
Convertible preferred stock converted to common stock, ratio | 4.103% | 4.103%
Series C Convertible Preferred Stock |  |
Stockholders Deficit [Line Items] |  |
Convertible preferred stock converted to common stock, ratio | 5.071% | 5.071%

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- Definition Conversion of preferred stock to common stock conversion ratio. + References No definition available. + Details
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- Definition Stockholders' deficit. + References No definition available. + Details
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- Details
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- Details
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- Details
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